Syringe-piston



(No Model.) .I

0. J. TAGLIABUE. SYRINGE PISTON. N 5 46, 603. Patented se ml'l, 1895..

WITNESSES: INVENTOR:

6. W S JfiarZeJJTayZZ'aZae. I 'I 7 BY a; ATTORNEYS.

NITED STATES CHARLES J. TAGLIABUE, OF BROOKLYN, NEW YORK.

SY RlNGE-PISTON.

SPECIFICATION forming part of Letters Patent No. 546,603, datedSeptember 17, 1895.

' Application filed January 3, 1895. Serial No. 533,763- (No model.)

To all whom it may concern:

Be it known that I, OHARLEsJ. TAGLIABUE, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented new and useful Improvements in Pistons for Syringes, of whichthe following is a specification.

In the manufacture of syringes difliculty is at times experienced inconsequence of the barrel possessing inequalities in the bore orcaliber, so that the piston-packing will not effect auniform tightclosing, and to overcome this difficulty the piston is made expansibleor adjustable, so as to [it or adapt itself to the variations incaliber, as set forth in the following specification and claims, andillustrated in the annexed drawings, in which Figure 1 is a sideelevation of the piston, sectioned along w 00, Fig. 2. Fig. 2 is asection along y y, Fig. 1. Fig. 3 is a detail view of a spring. Fig. 4:is a side elevation of a modification sectioned along uu, Fig. 5. Fig. 5is a section along 1) c, Fig. 4:.

The piston-rod 1 has placed thereon cupshaped packings of leather orother suitable material, each comprising a base'portion 2,

from which extends the annular flange portion 3. Against thepackingportion 2 is seated a disk or plate 4:. The nut 5 is screwed ontoa suitable thread on rod 1 and sits against the plate 4. This nut has aflange 6, between which and the plate 4: is seated aradially-expansiblespring 7. The packing part 3 is made.

to overlap the spring, so as to be yieldingly or adjustably pressed bythe latteragainst the barrel, said spring, with packing part 3, givinginward or outward as the bore of the barrel varies, so that the packingpart 3 always effects a tight closing or seat against the barreL- Thespring 7 is seated loosely about the nut 5 between the plate at and theflange 6, so as to be held in place while left to act freely upon thepacking. The spring is readily formed from a piece or strip of flatspring material, and by suitably tapering or inclining the meeting edges8 of the spring overlapping of the meeting portions of the spring isavoided, so that no unevenness or disturbing thickening of the springwill occur.

The pistonrod is shown provided with two packings 2 3, arranged as abovedescribed.

By placing an oil-well or chambered collar 9 between the packings, asshown, a proper lubrication can be effected to secure easy working.

In the modification shown in Fig. 4 the piston-rod 1 has a nut orshoulder 10, against which is made to sit the head 7 of a spring 7' 11,the radially-expansible spring-fingers, or part 11, of which act uponthe part 3 of the cup-shaped packing 2 3 to press said part 3 radiallyoutward v against the barrel of the syringe. The nut 12, screwed againstthe second spring 7 11,holds the packings and their adjacent partstogether and against the shoulder 10. If desired, the packing part 3,instead of being exposed to the pressure of but one spring 7, may beexposed to the pressure of several springs.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination of a screw-threaded piston -rod, a cup-shaped packingmounted thereupon, a nut screwed upon the piston-rod and located withinthe cup-shaped packing, and a radially expansible spring interposedbetween the nut and the base of the cup-shaped packing and acting topress the latter radially outward against the internal surface of thebarrel in which the piston operates, substantially as described. y

2. The combination with a screw-threaded piston-rod, a cup-shapedpacking mounted thereupon, a metallic plate arranged within thecup-shaped packing and bearing against the base portion thereof, a nutengaging the screw-threaded piston-rod, and a radially expansible springmounted on the piston-rod within the cup-shaped packing, and locatedbetween the said plate and the said nut for pressing the cup-shapedpacking laterally outward against the internal surface of the barrel inwhich the piston rotates, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

CHARLES J. TAGLIABUE. Witnesses:

J. W. TRASSAUER, E. F. KASTENHUBER.

